摘要
对不同生育期、不同程度、不同历时的水分胁迫及胁迫后复水条件下水稻叶面积变化规律和机理进行了研究,结果表明:土壤水分变化并未改变水稻叶面积在整个生育期间的单峰变化;水分胁迫对水稻叶面积的扩展生长存在抑制效应,抑制程度与胁迫程度、胁迫历时正相关;胁迫后复水对叶面积有补偿效应。重度胁迫大于轻度胁迫后复水的补偿效应。分蘖期轻度胁迫下胁迫时间越长补偿越明显,拔节期胁迫时间延长补偿效应降低。复水后加肥有助于叶面积补偿效应的提高,促进叶面积相对扩展速率增加并使响应时间提前。
Regularity and mechanism of rice leaf area under water stress and rewatering at different stages, severity degrees and duration time are investigated. The results show that change of soil water does not impact the single mount of rice leaf in the whole growth stage. Severity and duration time of water stress have a positive restraint influence on the expanding of rice leaf area. Compensatory growth of leaf area occurs after rewatering and the compensation effect of severe stress is more obvious than that of slight stress. In the tillering stage the increased stress duration leads to greater compensation effect under slight water stress, but in the jointing stage that decreases the compensation effect. Manure application after rewatering promotes the compensation effect, and increases the relative expanding rate of rice leaf area and makes effect ahead of response time to growth as well.
出处
《灌溉排水学报》
CSCD
北大核心
2005年第4期19-21,32,共4页
Journal of Irrigation and Drainage
基金
国家自然科学基金资助项目(50309003)
关键词
补偿效应
叶面积
水分胁迫
复水
水稻
compensation effect
leaf area
water stress
rewatering
rice
